I read this in Word by Word by Kory Stamper.
On that page, it says:
It will become clear to you, in the space between heart beats, why you are having a hard time with this entry: it is because you realise now that you do not in fact actually speak English---that the words you are reading are in some low German dialect and you are no longer certain that they mean anything.
The book is an account of dictionary writing by a lexicographer, which might clarify the meaning of "entry".
But I want to ask: does it mean that you are so obsessed with writing an entry that you forget the language you speak? And most important of all, how does it relate to the sentence after hyphen?